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Class Information
Number: 380/222
Name: Cryptography > Video cryptography > Video electric signal modification (e.g., scrambling) > By modifying synchronizing signal > Including phase inversion of scan line information
Description: Subject matter which inverts the phase of selected video scan line information signals.

Patents under this class:

Patent Number Title Of Patent Date Issued
8644379 De-interlacing method and method of compensating a de-interlaced pixel Feb. 4, 2014
8320564 Encrypted signal detection circuit and video device using the same Nov. 27, 2012
7706533 Copy protection for video signal using narrowed horizontal synchronization signals Apr. 27, 2010
7319755 Image altering apparatus and method for providing confidential viewing of a fundamental display image Jan. 15, 2008
7006632 Check authorization system and method Feb. 28, 2006
6836844 Information signal copy managing method, information signal recording method, information signal output apparatus, and recording medium Dec. 28, 2004
6091822 Method and apparatus for recording scrambled video audio signals and playing back said video signal, descrambled, within a secure environment Jul. 18, 2000
5912970 Television scrambling system Jun. 15, 1999
5768377 Video signal descrambling apparatus Jun. 16, 1998
5768376 Video signal scrambling apparatus Jun. 16, 1998
5631693 Method and apparatus for providing on demand services in a subscriber system May. 20, 1997
5539823 Subscription television picture scrambling and descrambling system providing compatibility with different such systems Jul. 23, 1996
5442700 Scrambling method Aug. 15, 1995
5272751 Pay television Dec. 21, 1993
5177787 Scrambler with self-calibration Jan. 5, 1993
5166976 System and method for detection of a pulse within a video signal Nov. 24, 1992
5161187 Cable television system Nov. 3, 1992
5142575 Method and apparatus for improving video scrambling and employing split sync pulses Aug. 25, 1992
5113440 Universal decoder May. 12, 1992
4924498 Method and apparatus for improving video scrambling and employing split snyc pulses May. 8, 1990
4885776 Television signal encoder with reduced transient switching effects Dec. 5, 1989
4817144 Secure TV scrambling system using framing code switching Mar. 28, 1989
4815129 Video encryption system Mar. 21, 1989
4725882 Scrambled video signal processor Feb. 16, 1988
4716588 Addressable subscription television system having multiple scrambling modes Dec. 29, 1987
4679078 High security subscription television transmission system Jul. 7, 1987
4667232 Synchronizing pulse restoration circuit May. 19, 1987
4575755 Video encoder/decoder system Mar. 11, 1986
4527195 Apparatus for encoding and decoding information Jul. 2, 1985
4396947 Apparatus for encoding of information Aug. 2, 1983
4340906 Video signal coding by video signal polarity reversal on the basis of brightness level comparison Jul. 20, 1982
4222068 Subscription television apparatus and methods Sep. 9, 1980
4075660 Pay television system with synchronization suppression Feb. 21, 1978

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